Context: Successful software projects control the challenges of project delays, cost overrun and delivering quality software products that satisfy customer needs. The specified software requirements are fundamental input of planning, executing, monitoring and controlling software development processes. In addition, software requirements drive software design, code, test cases, and documentation of software product. Therefore, quality of software requirements hold a critical importance for a successful software project. Objectives: This study empirically evaluates the perception of software professionals regarding relationship between qualities of software requirements and project success factors. Method: The study comprises of two steps. First we conducted a systematic mapping study and we identified 16 requirement qualities and their related 4 project success factors through analyzing 25 primary studies published between 2000 and 2024. In addition, we proposed a research model using the requirement qualities and the success factors. Second, we statistically validated the research model based on a survey among 202 software professionals. The Structural Equation Modeling (SEM) is applied on the survey responses to identify statistically significant requirement qualities and their relationship with the success factors. The SEM uses exploratory and confirmatory factor analysis and hypothesis testing. Results: The SEM confirms that survey responses of software professionals fit the research model. It confirms strong belief of software professionals that ten out of sixteen requirement qualities (RQ) are related to project success in terms of the cost containment, quality of software products, and effective software project management. The RQ include frozen system requirements, volatile requirements, requirement creep, unattainable requirements, and requirement change control, gold plating, requirements forward traceability, requirements backward traceability and verifiable requirements. Discussion: This study identified and evaluated requirement qualities related to project success factors. We recommend project managers to consider the proposed research model in better planning and executing requirements management process during software development life cycle.